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Sternoptyx Obscura
''Sternoptyx'' is an oceanic ray-finned fish genus which belongs in the family Sternoptychidae. This is the type genus of the Sternoptychidae, as well as the marine hatchetfish subfamily Sternoptychinae. ''Sternoptyx'' have silvery, high, and laterally compressed bodies and large, non-telescopic eyes. They are all relatively small, with even the largest species (''S. pseudobscura'' and ''S. pseudodiaphana'') not exceeding standard length. Species There are currently four recognized species in this genus: * ''Sternoptyx diaphana'' Hermann, 1781 (Diaphanous hatchetfish) * '' Sternoptyx obscura'' Garman, 1899 * '' Sternoptyx pseudobscura'' R. C. Baird, 1971 (Highlight hatchetfish) * '' Sternoptyx pseudodiaphana'' Borodulina, 1977 (False oblique hatchetfish) Fossils of this genus show that they have existed at least since the Early Oligocene, about 30 million years ago The abbreviation Myr, "million years", is a unit of a quantity of (i.e. ) years, or 31.556926 terasec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligocene
The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but the exact dates of the start and end of the epoch are slightly uncertain. The name Oligocene was coined in 1854 by the German paleontologist Heinrich Ernst Beyrich from his studies of marine beds in Belgium and Germany. The name comes from the Ancient Greek (''olígos'', "few") and (''kainós'', "new"), and refers to the sparsity of extant forms of molluscs. The Oligocene is preceded by the Eocene Epoch and is followed by the Miocene Epoch. The Oligocene is the third and final epoch of the Paleogene Period. The Oligocene is often considered an important time of transition, a link between the archaic world of the tropical Eocene and the more modern ecosystems of the Miocene. Major changes during the Oligocene included a global expansion o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samuel Garman
Samuel Walton Garman (June 5, 1843 – September 30, 1927), or "Garmann" as he sometimes styled himself, was a naturalist/zoologist from Pennsylvania. He became noted as an ichthyologist and herpetologist. Biography Garman was born in Indiana County, Pennsylvania, on 5 June 1843. In 1868 he joined an expedition to the American West with John Wesley Powell. He graduated from the Illinois State Normal University in 1870, and for the following year was principal of the Mississippi State Normal School. In 1871, he became professor of natural sciences in Ferry Hall Seminary, Lake Forest, Illinois, and a year later became a special pupil of Louis Agassiz. He was a friend and regular correspondent of the naturalist Edward Drinker Cope, and in 1872 accompanied him on a fossil hunting trip to Wyoming. In 1870 he became assistant director of herpetology and ichthyology at Harvard's Museum of Comparative Zoology. His work was mostly in the classification of fish, especially sharks, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ray-finned Fish Genera
Actinopterygii (; ), members of which are known as ray-finned fishes, is a class of bony fish. They comprise over 50% of living vertebrate species. The ray-finned fishes are so called because their fins are webs of skin supported by bony or horny spines (rays), as opposed to the fleshy, lobed fins that characterize the class Sarcopterygii (lobe-finned fish). These actinopterygian fin rays attach directly to the proximal or basal skeletal elements, the radials, which represent the link or connection between these fins and the internal skeleton (e.g., pelvic and pectoral girdles). By species count, actinopterygians dominate the vertebrates, and they constitute nearly 99% of the over 30,000 species of fish. They are ubiquitous throughout freshwater and marine environments from the deep sea to the highest mountain streams. Extant species can range in size from ''Paedocypris'', at , to the massive ocean sunfish, at , and the long-bodied oarfish, at . The vast majority of Actinop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extant Rupelian First Appearances
{{disambig ...
Extant is the opposite of the word extinct. It may refer to: * Extant hereditary titles * Extant literature, surviving literature, such as ''Beowulf'', the oldest extant manuscript written in English * Extant taxon, a taxon which is not extinct, such as an extant species * Extant Theatre Company, a disability arts organisation * ''Extant'' (TV series), an American television series * Hank Hall, also known as Extant, a DC Comics supervillain See also * Extent (other) Extent may refer to: Computing * Extent (file systems), a contiguous region of computer storage medium reserved for a file * Extent File System, a discontinued file system implementation named after the contiguous region * Extent, a chunk of st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Million Years Ago
The abbreviation Myr, "million years", is a unit of a quantity of (i.e. ) years, or 31.556926 teraseconds. Usage Myr (million years) is in common use in fields such as Earth science and cosmology. Myr is also used with Mya (million years ago). Together they make a reference system, one to a quantity, the other to a particular place in a year numbering system that is ''time before the present''. Myr is deprecated in geology, but in astronomy ''Myr'' is standard. Where "myr" ''is'' seen in geology it is usually "Myr" (a unit of mega-years). In astronomy it is usually "Myr" (Million years). Debate In geology a debate remains open concerning the use of ''Myr'' (duration) plus ''Ma'' (million years ago) versus using only the term ''Ma''. In either case the term '' Ma'' is used in geology literature conforming to ISO 31-1 (now ISO 80000-3) and NIST 811 recommended practices. Traditional style geology literature is written The "ago" is implied, so that any such year number "X Ma" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Oligocene
The Rupelian is, in the geologic timescale, the older of two ages or the lower of two stages of the Oligocene Epoch/Series. It spans the time between . It is preceded by the Priabonian Stage (part of the Eocene) and is followed by the Chattian Stage. Name The stage is named after the small river Rupel in Belgium, a tributary to the Scheldt. The Belgian Rupel Group derives its name from the same source. The name Rupelian was introduced in scientific literature by Belgian geologist André Hubert Dumont in 1850. The separation between the group and the stage was made in the second half of the 20th century, when stratigraphers saw the need to distinguish between lithostratigraphic and chronostratigraphic names. Stratigraphic definition The base of the Rupelian Stage (which is also the base of the Oligocene Series) is at the extinction of the foraminiferan genus ''Hantkenina''. An official GSSP for the base of the Rupelian has been assigned in 1992 (Massignano, Italy). The transi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oksana Dmitrievna Borodulina
Oksana or Oxana (, ; be, Аксана), sometimes transliterated as Aksana, is a female given name of Ukrainian origin. The closest equivalent is the Russian name '' Kseniya'' (russian: Ксения, links=no), but the two names coexist in use in both countries and neither of them is a shortening of the other. Origin The names Oksana (), Xana (), Sana () and Kseniya (russian: Ксения, Xenia) are thought to originate from one of two Greek words: Xenia (hospitality) or Xenos (stranger). the dictionary of Russian names. Axana is another alternative spelling. People Oksana * (born 1987), Russian actress *[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sternoptyx Pseudodiaphana
''Sternoptyx'' is an oceanic ray-finned fish genus which belongs in the family Sternoptychidae. This is the type genus of the Sternoptychidae, as well as the marine hatchetfish subfamily Sternoptychinae. ''Sternoptyx'' have silvery, high, and laterally compressed bodies and large, non-telescopic eyes. They are all relatively small, with even the largest species (''S. pseudobscura'' and ''S. pseudodiaphana'') not exceeding standard length. Species There are currently four recognized species in this genus: * ''Sternoptyx diaphana'' Hermann, 1781 (Diaphanous hatchetfish) * ''Sternoptyx obscura'' Garman, 1899 * ''Sternoptyx pseudobscura'' R. C. Baird, 1971 (Highlight hatchetfish) * '' Sternoptyx pseudodiaphana'' Borodulina, 1977 (False oblique hatchetfish) Fossils of this genus show that they have existed at least since the Early Oligocene, about 30 million years ago The abbreviation Myr, "million years", is a unit of a quantity of (i.e. ) years, or 31.556926 terasecon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ronald Clay Baird
Ronald is a masculine given name derived from the Old Norse '' Rögnvaldr'', Hanks; Hardcastle; Hodges (2006) p. 234; Hanks; Hodges (2003) § Ronald. or possibly from Old English '' Regenweald''. In some cases ''Ronald'' is an Anglicised form of the Gaelic '' Raghnall'', a name likewise derived from ''Rögnvaldr''. The latter name is composed of the Old Norse elements ''regin'' ("advice", "decision") and ''valdr'' ("ruler"). ''Ronald'' was originally used in England and Scotland, where Scandinavian influences were once substantial, although now the name is common throughout the English-speaking world. A short form of ''Ronald'' is ''Ron''. Pet forms of ''Ronald'' include ''Roni'' and ''Ronnie''. ''Ronalda'' and ''Rhonda'' are feminine forms of ''Ronald''. ''Rhona'', a modern name apparently only dating back to the late nineteenth century, may have originated as a feminine form of ''Ronald''. Hanks; Hardcastle; Hodges (2006) pp. 230, 408; Hanks; Hodges (2003) § Rhona. The names ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sternoptyx Pseudobscura
''Sternoptyx'' is an oceanic ray-finned fish genus which belongs in the family Sternoptychidae. This is the type genus of the Sternoptychidae, as well as the marine hatchetfish subfamily Sternoptychinae. ''Sternoptyx'' have silvery, high, and laterally compressed bodies and large, non-telescopic eyes. They are all relatively small, with even the largest species (''S. pseudobscura'' and ''S. pseudodiaphana'') not exceeding standard length. Species There are currently four recognized species in this genus: * ''Sternoptyx diaphana'' Hermann, 1781 (Diaphanous hatchetfish) * ''Sternoptyx obscura'' Garman, 1899 * '' Sternoptyx pseudobscura'' R. C. Baird, 1971 (Highlight hatchetfish) * '' Sternoptyx pseudodiaphana'' Borodulina, 1977 (False oblique hatchetfish) Fossils of this genus show that they have existed at least since the Early Oligocene, about 30 million years ago The abbreviation Myr, "million years", is a unit of a quantity of (i.e. ) years, or 31.556926 teraseco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sternoptyx Obscura
''Sternoptyx'' is an oceanic ray-finned fish genus which belongs in the family Sternoptychidae. This is the type genus of the Sternoptychidae, as well as the marine hatchetfish subfamily Sternoptychinae. ''Sternoptyx'' have silvery, high, and laterally compressed bodies and large, non-telescopic eyes. They are all relatively small, with even the largest species (''S. pseudobscura'' and ''S. pseudodiaphana'') not exceeding standard length. Species There are currently four recognized species in this genus: * ''Sternoptyx diaphana'' Hermann, 1781 (Diaphanous hatchetfish) * '' Sternoptyx obscura'' Garman, 1899 * '' Sternoptyx pseudobscura'' R. C. Baird, 1971 (Highlight hatchetfish) * '' Sternoptyx pseudodiaphana'' Borodulina, 1977 (False oblique hatchetfish) Fossils of this genus show that they have existed at least since the Early Oligocene, about 30 million years ago The abbreviation Myr, "million years", is a unit of a quantity of (i.e. ) years, or 31.556926 terasec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
